クロム・タングステン・マンガン系ゲージ用不收縮鋼の熱處理

概要

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Cr-W-Mn non-shrinkiug steels (C 1%, Mn 0.6∿1.0%. Cr 0.9∿1.0%, W 0.8∿1.5%) are generally used for gauge steels. We studied the heat-treatment of such steels using the Rockwell tester and the Skoda-Sawin wear testing machine and obtained the following result : (1) The suitable oil quenching temperature for both hardness and wear resistance is about 840°∿860℃ and the tempering temperature is about 100∿150℃. (2) Even when water (NaCl 10%) heated up to 80℃ or oil up to 180℃ are used for quenching media, the same hardness with that gained in the normal manner may be obtained. Moreover, when the temperature of the quenching medium exceeds 75℃, the expansion of the specimen diameter shows less change than when quenched in the oil of lower temperature. Such results may be applicable to the austempering process. (3) When tempered at 100℃, the hardness rises a little during the first minutes and since then shows little change. (4) The expansion of specimen by quenching in oil shows about 0.20mm/ICOmm in length and about 0.01mm/8mm in diameter. The maximum expansion is gained by oil quenching at 840∿870℃ and by water quenching at 780℃. (5) Age hardening of this steel is so remarkable that two days are required to reach the maximum hardness. Aging at 100℃ for only five hours is nearly enough to develop the stability of steel.
社団法人日本鉄鋼協会の論文
1942-10-25